All i was able to take out of it if I'm correct (SPOILER MAYBE!?), Flynn starts to hallucinate heavily which is getting worse, Flynn walking to the bar doesn't happen, it was just him walking to the mines. Carl and Dax finds Flynn in the mines, but Flynn is so out of it in his hallucinations, scaring them off and possibly abandoning Flynn in the mines. Flynn continues to allows whatever is possessing him take over, causing Flynn to be stuck in his hallucinations possibly for the rest of his life. Leading to The End.
If anyone else has any other theories, please tell. This ending just seems really downer, Flynn isn't able to get any satisfaction at all unlike Chase in every other route.